Instructions for modifying garamondx font metrics.
1. Copy this entire folder to an area in which you have write permission.
2. Make changes in the adjust-gm-*.mtx files.
3. Run
tex zgm-drv
to recreate new vpl files.
4. Make tfm/vf files from the vpl files. With a bash shell, you could use:
for f in T*.vpl; do ff=${f%.*}; vptovf ${ff} ${ff} ${ff}; done
5. Replace the distributed tfm/vf files with the newly generated tfm/vf files.